19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Water gas is produced by (AIPMT 1992)
Which of the following groups of ions makes the water hard? (AIPMT 1994)
Which one of the following processes will produce hard water? (RPMT 2008)
Hydrogen sulphide is acidic while water is neutral. The reason is (RPMT 2010)
At its melting point, ice is lighter than water because (AIPMT 1992)
The volume strength of 1.5 N H2O2 solution is (AIPMT 1997)
The formula of exhausted permutit is
Which of the following is a true structure of H2O2 in solid phase ? (a) (b) (c) (d)
The formula for permutit or zeolite which is used as softener in ion-exchange method is
When CO2 is bubbled through a solution of barium peroxide in water
A water sample is said to contain permanent hardness if water contains
Which of the following is not a disadvantage of using hard water?
The temporary hardness of water due to calcium bicarbonate can be removed by adding
Which of the following metals evolves hydrogen on reacting with cold dilute HNO3? (AIPMT 1989)
The exhausted cation and anion exchange resin beds are regenerated by treatment with
Which of the following compounds is used for water softening? (a) Ca PO (b) Na PO (c) Na P O (d) Na HPO
Temporary hardness of water is due to the presence of
Number of parts by weight of calcium carbonate present in …….defined as the degree of hardness of water. Fill the blank with an appropriate statement.
The ionization of hydrogen atom would give rise to (AIPMT 1990)
Presence of water can be detected by
Which of the following reactions shows reduction of water ?
The hardness of water is estimated by
Which is not a property of water ?
The density of water is less in its solid state because
Water plays a key role in the biosphere. It is due to certain properties of H2O as compared to other liquids. Which of these is not a correct property of water?